import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.FutureTask;
//基于 Callable 实现 1+2+3+...+1000
public class demo8 {
    public static void main(String[] args) throws InterruptedException, ExecutionException {
        Callable<Integer> callable = new Callable<Integer>() {
            @Override
            public Integer call() throws Exception {
                int count = 0;
                for (int i = 1; i <= 1000; i++) {
                    count += i;
                }
                return count;
            }
        };
        FutureTask<Integer> futureTask = new FutureTask<>(callable);
        Thread t = new Thread(futureTask);
        t.start();
        t.join();
        System.out.println("count:" +futureTask.get() );
    }
}
